Database/Colorant/CI 15525
Mostly petroleum · ISO 16128

Is CI 15525 natural?

Mostly not. Calcium/sodium lake of a chlorinated naphthol azo dye; only the metal ions and sulfonate fragments are mineral-origin, the chlorinated chromophore is synthetic.

INCI nameCI 15525
CAS5850-80-6
FormulaC34H18CaCl2N4Na2O12S2 · 895.6 Da
FunctionColorant
FeedstockCalcium/sodium lake pigment of a chlorinated naphthalene monoazo…

How we scored it

2 Na + Ca + 2x SO3 sulfonate fragments (natural mineral counter-ions, 246 Da) + chlorinated naphthalene-azo-dicarboxylate chromophore (petrochemical, 649 Da) = 246/896 = 0.27
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Calcium/sodium lake pigment of a chlorinated naphthalene monoazo dye, made by diazotization and coupling of petrochemical aromatic amines, then precipitated as the mixed calcium/sodium salt. Only the inorganic counter-ions are natural-origin.

In plain English

A synthetic red pigment, a calcium/sodium 'lake' form of a chlorinated dye, used to colour cosmetic products. Manufactured from man-made aromatic chemical intermediates.

CosIng definition: CI 15525 is classed chemically as a monoazo colour. It conforms to the formula:

Natural alternatives with the same function

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 Calcium Ferrite 100% natural origin

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 Calcium Stearate 100% natural origin

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Structure

2D structure of CI 15525

calcium;disodium;bis(4-carboxy-5-chloro-2-[(2-oxidonaphthalen-1-yl)diazenyl]benzenesulfonate)

PubChem CID 135565416 ↗

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2CI 15525. PubChem CID 135565416. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15525. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15525. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015525